Electrochemical Characterization of Single Layer Graphene/Electrolyte Interface: Effect of Solvent on the Interfacial Capacitance.
Electrochemical Characterization of Single Layer Graphene/Electrolyte Interface: Effect of Solvent on the Interfacial Capacitance.
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单层石墨烯/电解质界面的电化学表征：溶剂对界面电容的影响
DOI：
10.1002/anie.202017057
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发表时间：
2021-06-07
期刊：
影响因子：
--
通讯作者：
Simon P
中科院分区：
文献类型：
--
作者：
Wu YC;Ye J;Jiang G;Ni K;Shu N;Taberna PL;Zhu Y;Simon P
对用于能量存储应用的电极中的电荷存储机制的基本理解的发展需要对电极/电解质界面进行深入表征。在这项工作中，我们研究了单层石墨烯（SLG）电极作为模型材料，在纯（EMIm-TFSI）和溶剂化（与乙腈）离子液体电极的双层电容的电荷。电化学阻抗谱和重量电化学石英晶体微天平（EQCM）测量的组合证明，溶剂的存在下，大大增加了电荷载流子密度在SLG/离子液体界面。因此，电容不仅由石墨烯的电子性质决定，而且还由SLG表面处的电解质侧的特定组织决定，所述特定组织源自EMIm+阳离子与SLG表面之间存在的强相互作用。EQCM测量还表明，存在sp2碳的碳结构通过有利于SLG电极上的反离子吸附而不是无定形多孔碳中的离子交换机制来影响电荷存储机制。在纯（EMIm-TFSI）和溶剂化（用乙腈）离子液体电极中研究单层石墨烯（SLG）电极处的双层电容的电荷。电化学阻抗谱和重量电化学石英晶体微天平测量的证据表明，溶剂的存在下大大增加了SLG/离子液体界面的载流子密度。
The development of the basic understanding of the charge storage mechanisms in electrodes for energy storage applications needs deep characterization of the electrode/electrolyte interface. In this work, we studied the charge of the double layer capacitance at single layer graphene (SLG) electrode used as a model material, in neat (EMIm‐TFSI) and solvated (with acetonitrile) ionic liquid electrodes. The combination of electrochemical impedance spectroscopy and gravimetric electrochemical quartz crystal microbalance (EQCM) measurements evidence that the presence of solvent drastically increases the charge carrier density at the SLG/ionic liquid interface. The capacitance is thus governed not only by the electronic properties of the graphene, but also by the specific organization of the electrolyte side at the SLG surface originating from the strong interactions existing between the EMIm+ cations and SLG surface. EQCM measurements also show that the carbon structure, with the presence of sp2 carbons, affects the charge storage mechanism by favoring counter‐ion adsorption on SLG electrode versus ion exchange mechanism in amorphous porous carbons. The charge of the double layer capacitance at a single layer graphene (SLG) electrode was studied in neat (EMIm‐TFSI) and solvated (with acetonitrile) ionic liquid electrodes. Electrochemical impedance spectroscopy and gravimetric electrochemical quartz crystal microbalance measurements evidence that the presence of solvent drastically increases the charge carrier density at the SLG/ionic liquid interface.
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